100104

Appears in sequences

• Smallest k whose 'Reverse and Subtract' trajectory has a preperiodic part of length n.at n=15A072138
• Triangle read by rows: n-th row contains the first n n-digit multiples of n with digit sum n. If there are fewer than n such numbers, the rest of the row is filled with 0's.at n=18A084029
• Sums of squares of primitive roots of primes.at n=23A089453
• Suppose you take the ten digits 0..9, arrange them in any order and then either concatenate adjacent ones or separate them with a plus or minus sign, e.g., 98-76+5-4-32+10 or 9-8-765+3041-2. The first expression totals to "1", the second example totals to "2275". This sequence lists the positive integers that cannot be expressed in this way.at n=26A108224
• Integers whose decimal representation consists of three distinct digits, one appearing once, one appearing twice, and one appearing three times.at n=26A182040
• Smallest number with n nonprime substrings (Version 2: substrings with leading zeros are counted as nonprime if the corresponding number is > 0).at n=17A213303
• Smallest number with n nonprime substrings (Version 3: substrings with leading zeros are counted as nonprime if the corresponding number is not a prime).at n=17A213304
• "Inside numbers". Pick a term "t" and one of its digits "d". Now jump to the right over d digits if "d" is odd, and to the left over d digits if "d" is even. Whatever the "d" you choose, you will stay on "t".at n=45A284515